v3.10.0.1
Document And Entity Information - USD ($)
12 Months Ended
Jul. 31, 2018
Aug. 31, 2018
Jan. 31, 2018
Entity Registrant Name FERRELLGAS PARTNERS L P    
Entity Central Index Key 0000922358    
Current Fiscal Year End Date --07-31    
Entity Filer Category Accelerated Filer    
Document Type 10-K    
Document Period End Date Jul. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   97,152,665  
Trading Symbol fgp    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 304,943,297
Ferrellgas Partners Finance Corp. [Member]      
Entity Registrant Name FERRELLGAS PARTNERS FINANCE CORP    
Entity Central Index Key 0001012493    
Current Fiscal Year End Date --07-31    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Jul. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   1,000  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Ferrellgas, L.P. [Member]      
Entity Registrant Name FERRELLGAS L P    
Entity Central Index Key 0000922359    
Current Fiscal Year End Date --07-31    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Jul. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Ferrellgas Finance Corp. [Member]      
Entity Registrant Name FERRELLGAS FINANCE CORP    
Entity Central Index Key 0000922360    
Current Fiscal Year End Date --07-31    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Jul. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   1,000  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes